【作者】 董洪波； 陈雪峰； 李兵； 祁克玉； 何正嘉；

【Author】 Dong Hongbo Chen Xuefeng Li Bing Qi Keyu He Zhengjia (State Key Laboratory for Manufacturing Systems Engineering,Xi’an Jiaotong University,Xi’an 710049)

【机构】 西安交通大学机械制造系统工程国家重点实验室；

【摘要】 研究了一种基于小波有限元模型与高精度模态参数辨识的转子横向裂纹检测新方法。将转子系统通过区间B样条小波有限元建模,转子裂纹等效为旋转弹簧,建立裂纹诊断数据库。为了从结构脉冲响应信号中精确识别结构模态参数,提出一种基于Laplace小波相关滤波的结构模态参数精确识别方法。利用提出的方法可以精确的获取转子系统的前三阶固有频率值。将其带入裂纹诊断数据库,获得前三阶固有频率等高线,三条曲线的交点定量的识别了转子的裂纹参数。试验结果表明,所提出的方法能够比较精确的识别转子裂纹的位置和深度,方法的有效性得到了验证。更多还原

【Abstract】 In this paper,a new method based on high precision modal parameter identification method and wavelet Finite Element(WFE)Model is presented to determine the depth and location of a transverse surface crack in a rotor system.The rotor system is modeled using finite element method of B-spline wavelet on the interval (FEM BSWI),while the crack is equivalent as a weightless rotational spring.Additionally,a novel method based on Empirical Mode Decomposition(EMD)and Laplace wavelet is proposed to acquire modal parameters with high precision,which is implemented to improve the precision of crack identification.By providing the first three natural frequencies,contours for the specified natural frequency are plotted in the same coordinate,and the intersection of the three curves predicts the crack location and size.The experimental results indicate that the proposed method can accurately identify the position and depth of different cracks.The effectiveness and reliability of the proposed method is verified.更多还原